Paraformaldehyde and peroxid mixture.



umrso STATES PAT NT orrron ARTHUR EIOHENGRUN,

OF DESSELDORF, GERMANY, ASSIGNOR TO FARBENFABRIKEN v VORM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

PABAFORMALD EHYDE AND PEROXID MIXTURE.

Specification of Letters Patent.

Patented Sept. 24, 1907.

To all whom it may concern:

Be it known that I, ARTHUR EIcHENoaiiN, doctor of philosophy, chemist, a citizen of the German Empire, residing at Dusseldorf, Germany, Kingdom of Prussia, have inventqdnew and-useful Improvements in Para-- formaldehyde and Peroxid Mixtures ,"of which the following is a specification.

My invention relates to new preparations generating gaseous formaldehyde by treating them with water. The new preparations are mixtures of metal peroxide having an alkaline reaction with polymeric formaldehyde e. g. paraformaldehyde or trioxymethylene. For this purpose peroxide, such as sodium peroxid' Nat- 0 barium peroxid BaO,, strontium peroxid 510 etc. are mixed e. g. with paraformaldehyde and subsequently water is added to this mixture. The mixtures of peroxide with the bodies giving off the formaldehyde may be pressed into pastils or larger pieces and in this form are ready to use. The new preparations are of great advantage for disinfecting by means of formaldehyde. o I

On employing sodium peroxid the reaction is so violent that the mixture takes fire and an explosion may even occur. In this case an indifierent product, such as sodium carbonate, or the like, most be-addedto the mixture to moderate the reaction. Good results are for instance attained on using 25 parts of a mixture V, containing 2Q parts of barium peroxid and one part of paraformaldehyde and from 1520 parts of water. A

lively evolution of gas ensues with disengagement of heat and after a short'while a violent e'bullition takes place and streams of formaldehyde and-steam are given off which can be made use of for disinfecting closed rooms. On using a mixture of 3parts oi strontium peroxid, one part of paraformaldehyde and 20 parts of water a regular continuous evolution offormaldehyde can be produced with only slight disengagement of heat. The quantity of water used can be largely increased.

Having now described my invention and in what manner the same is to be performed, what I claim as new and desire to secure by Letters Patent is:

1. A composition of matter generating gaseous tormaldehyde and water vapor when treated with water, and consisting of a mixture of polymeric formaldehyde with metal peroxids having an alkaline reaction, substantially as hereinbetore described.

2. A composition of matter generating gaseous formaldehyde and water vaporwhen treated with water, and consisting of a mixture or paratormaldehyde with metal peroxids having an alkaline reaction, substantially as hereinbefore described.

3. A composition of matter generating. gaseous formaldehyde and water vapor when treated with water, and consisting or a mixture or paratormaldehyde with barium peroxid, substantially as hereinbetore described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ARTHUR EICHENGRUN.

Witnesses:

OTTO Konro, J. A. Brnxnsmus. 

